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I'm trying to motivate the theory of general relativity. Concretely, using which arguments is it deduced that spacetime must have the structure of a curved Riemannian manifold? From the strong...
Asked on 05/21/2021 by P11P
3 answerAs you've read on the title, my problem is about an oblique incidence problem over a stratified electrical medium. I've made a quick sketch with the incidence on the first...
Asked on 05/21/2021 by gab____
0 answerThe magnetic field from a wire wraps around it. The direction depends on the direction of the current. This means that the magnetic field passes through the center of...
Asked on 05/21/2021 by Mark Kettle
0 answerI'm trying to solve an excercise that involves first order perturbation theory and an infinite potential. To ease the problem, I tried to consider an easier one dimensional model. Consider...
Asked on 05/21/2021 by user85231
2 answerAs depicted in the image below borrowed from this page the motion of the rotor in an electric motor can be explained by appealing to the Lorentz...
Asked on 05/21/2021 by user263399
1 answerReading from example the old question, Angular Momentum and Kepler's Second Law Considering that now I not remember the proof because starting from the angular moment conservation of ...
Asked on 05/21/2021
1 answerThis relates to page 20 of Peskin and Schroeder. They state that the Fourier transform of the Klein-Gordon field satisfies the following: $$left[frac{partial^2}{partial t^2}+(|vec p|^2+m^2)right]phi(vec p,t)=0 tag{2.21},$$ which is...
Asked on 05/21/2021
1 answerI'm trying to understand the gradient expansion within the Keldysh formalism. In particular, I am reading "Quantum Field Theory of Non-equilibrium States" by J. Rammer, section 7.2,...
Asked on 05/21/2021 by surrutiaquir
2 answerOn PDG, page 6 ff., we can find the branching ratios for the different $tau$ decay channels. My problem is that taken together, these do not...
Asked on 05/21/2021
1 answerCurrently I am learning about regularization, renormalization and the renormalization group. In particular, a lot of detail is devoted to dimensional regularization. There are a couple of things I struggle...
Asked on 05/21/2021 by maarten442
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